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CNBC's Michelle Caruso-Cabrera looks at how Puerto Rico, an island with a population of 3.7 million, came to owe more than $70 billion. The government has raised taxes and cut pensions to help make up the shortfall.

CNBC's Michelle Caruso-Cabrera reports there is a special exemption law in U.S. securities law that if you live in a territory like Puerto Rico, you can invest in closed-end funds in which you get tax-free dividends.